Condensed Consolidated Statements Of Cash Flows (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities
Net income	$ 479.9	$ 374.5
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	58.5	49.1
Stock-based compensation expense	43.2	41.3
Excess tax benefits from stock-based compensation plans	(6.0)	(6.1)
Legacy Tax Matters	(6.4)
Changes in assets and liabilities:
Accounts receivable	97.5	31.1
Other current assets	80.6	(1.1)
Other assets	24.2	(46.2)
Accounts payable and accrued liabilities	(70.7)	24.7
Restructuring	(0.1)	(4.7)
Deferred revenue	(26.3)	(30.7)
Unrecognized tax benefits	(0.1)	21.8
Other liabilities	(8.0)	21.0
Net cash provided by operating activities	666.3	474.7
Cash flows from investing activities
Capital additions	(53.6)	(54.6)
Purchases of short-term investments	(28.9)	(24.0)
Sales and maturities of short-term investments	27.3	23.6
Cash paid for acquisitions	(10.1)
Net cash used in investing activities	(65.3)	(55.0)
Cash flows from financing activities
Issuance of commercial paper		2,232.8
Repayments of commercial paper		(2,661.5)
Issuance of notes		496.9
Repayments of notes	(7.5)	(1.9)
Net proceeds from stock-based compensation plans	37.6	26.0
Cost of treasury shares repurchased	(333.8)	(119.6)
Excess tax benefits from stock-based compensation plans	6.0	6.1
Payment of dividends	(89.9)	(74.1)
Payment of dividends to noncontrolling interests	(4.8)	(4.4)
Payments under capital lease obligations		(1.0)
Debt issuance costs and related fees		(4.0)
Net cash used in financing activities	(392.4)	(104.7)
Effect of exchange rate changes on cash and cash equivalents	(14.0)	4.8
Net increase in cash and cash equivalents	194.6	319.8
Cash and cash equivalents, beginning of the period	659.6	473.9
Cash and cash equivalents, end of the period	$ 854.2	$ 793.7